Consolidated Balance Sheets Balance Sheet Parenthetical - $ / shares	Sep. 29, 2015	Dec. 30, 2014
Capital Unit [Line Items]
Treasury Stock, Shares	6,806,224	5,260,744
Common Class A [Member]
Capital Unit [Line Items]
Common Stock, Shares Authorized	112,500,000	112,500,000
Common Stock, Shares, Issued	30,827,452	30,703,472
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding	24,021,228	25,442,728
Common Class B [Member]
Capital Unit [Line Items]
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	1,381,730	1,381,865
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding	1,381,730	1,381,865
Preferred Stock [Member]
Capital Unit [Line Items]
Preferred Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0